56 STROPHOCHEILUS-THAUMASTUS. 



This form, which seems nearly allied to 8. tceniolus, S. brephoides, 

 and especially S. inca, has not been satisfactorily identified, and I 

 have, therefore, repeated the Spix-Waguer description and figure. 



Pfeiffer has figured a form (pi. 28, figs. 2, and 3) under this name 

 which he describes as follows : 



" Shell imperforate, oblong, solid, striatulate, brownish, irregu- 

 larly streaked with rufous, and with one whitish band. Spire 

 lengthened, convex-turrited, the apex obtuse ; suture impressed, 

 subirregular. Whorls 7, but slightly convex, the last one about f 

 the length, slightly narrowed at base. Columella white, obliquely 

 receding, subplicate, calloused at base. Aperture oblique, acumin- 

 ate, semi-oval, somewhat pearly inside ; peristome straight, some- 

 what thickened, the right margin lightly arcuate, basal regularly 

 arcuate. Alt. 58, diam. 20 J, aperture, alt. 24, width 11 mill. 

 Brazil." 



Whether this is identical with the shell collected by Spix is some- 

 what doubtful. It should be compared with S. inca Orb. The 

 original description of Bulinus sordidus here follows: 



" T. pyramidali, transversim striata, fusca ; anfr. basali ad sutu- 

 ram subalbido; linea subcentrica pallida ; labii vix reflexi margine 

 albo. Long. HI, lat. $ poll. Habitat ad Brasiliam (Rio de Jan- 

 eiro)." 



No other information has been published. 



S. INCA Orbigny. PI. 28, figs. 10, 11. 



Shell lengthened, very obviously perforated, thick ; uniform 

 blackish-brown, paler toward the apex ; nearly smooth, with some 

 growth-lines ; spire much elongated, a little swollen, conic above 

 and rather obtuse ; whorls 8-9, quite convex, separated by a deep, 

 nearly smooth or irregular suture. Aperture oval, peristome white, 

 much thickened within ; columella thick, straight. 



Alt. 77, diam. 31 mill. (Orb.). 



Near Carcuata, Prov. of Yungas ; and ravine of Tutulima north of 

 Cochabamba, northeast of the eastern Cordillera oj Bolivia (Orb.). 



Helix inca D'ORB., Mag. de Zool., 1835, p. 16. Bulimus inca 

 D'ORB., Voy. dans 1'Amer. Merid., p. 292, pi. 38, f. 6, 7. PFR., 

 Monogr., ii, p. 142 ; iii, p. 324. REEVE, Conch. Icon., pi. 53, f. 

 346. Bulinus inca SOWB., Conch. Illustr, f. 67. 



Allied to S. spixii Wagn. 



